Binder supply system



H. C. HETTELSATER BINDER SUPPLY SYSTEM origina Filed Dec. 1;, 1943 Nov.14, 1950 Patented Nov. 14, 1950 BINDER SUPPLY SYSTEM 'Henry 0.Hettelsater, Whitefish Bay, Wis, assignor to *Harnischfeger Corporation,Milwaukee,'Wis., a corporation of Wisconsin Original applicationDecember 13; 1943, Serial N 0.

514,177. Divided and this application December 15, 1944, Serial No.568,255

4 Claims.

The invention relates to a traveling material treating apparatus forconditioning the material. used for making roads or other pavements atthe place of use.

This application is a division of my copending application Serial No.l4,l77,'filed December 13, 1943, now U. S. Patent No. 2,424,459, datedJuly 22, 1947, and relates more particularly to the means for supplyingthe binder ingredient to the road materials during the mixing operation.

According to the aforesaid application, in the making of road or otherpavements, the material operated upon by the soil treating unit issubjected to the action of a rotary cutter and a target rotor tothoroughlymix and blend the material which is then transferred to ablading mill where it is further mixed and then deposited upon the roadbed. During the transfer of the blended road materials they are sprayedwith a suitable binder ingredient with which they are thoroughly'mixedwhile in the blading mill. The binder ingredient is carried ortemporarily stored in the transporting unit, and according to thepresent invention, means are provided on said unit for putting binderingredient under pressure and delivering it under the control of theoperator to the spraying device on the treating apparatus. As the binderingredients may be of different kinds, such as water in the case of acement binder and petrolerun in case of an asphaltic pavement, provisionis made for handling both types of binder ingredient through the samespraying apparatus as hereinafter explained.

The invention further consists in the several features hereinafterdescribed and more particularly defined by claims at the conclusionhereof.

in the drawings:

Fig. 1 is a diagrammatic showing of the binder supply system and itscontrols;

Fig. 2 is a detailed vertical sectional view taken through one of thespring loaded hydraulic actuators.

Referring to Fig. 1 of the drawing, the numeral it designates the engineof the propelling unit it which it drives. Engine it also drives a pumpwhich supplies hydraulic operating to a pipe which joins with a volumelimiting T-coupling 5i throughwhich the fluid has free passagev into.pipe 52. T-coupli-ng 5i i so. arranged that a branching stream of fluidof limited volume may escape therefrom into pipe 53 whichas hereinafterdescribed connects with a. pipe 2:95.

The pipe 52 connects'with a second volume limiting T-coupling 64 similarin all respects to the T-coupling 5I through which fluid may freely passto pipe 65 while a limited stream-may escape into-pipe 5t. Pipe 65 inturn joins w'ith a fixed aperture back pressure orifice 5! soconstructed as topermit fluid topass therethrough but to maintain aheadof it a pressure equal to the intended operating pressure of the system.Pressure fluid returns to the supply tank &3 through pipes 69 and 62 andis carried to the pump is through pipe 49a.

Tanks 3 and '5 for binder ingredient are suitabl mounted on thetransporting unit II.

Because of the variation in viscosity between water and the bituminousbinder compositions to be handled, two pumps, one a centrifugal pump 58,and theother ofthe positive displacement type pump, M8, are provided.'These'pumps through suitable clutch mechanism shown in full inthe'application heretofore referred to are adapted to be selectively'orconjointly connected to an engine or prime mover I45.

A cross connecting pipe I51 provided with Ts I52, 153, I56 connects atits ends with tanks t and '5 and has a valve I-55'mounted thereinbetween the-T's I56 and 553.

Pump MB'is connected on its suction side with the pipe 55! at the T E53b a pipe which rises and passes through the valve E and then to thepump. Pump 155 is connected on its suction side with the pipe 15-h atthe T 155 by a pipe I59 which has avalve 16!] mounted therein. In thisway the pumps M8 and E53 being connected-to the crosspipe-IEH onopposite sides of the valve H55 and each being provided with a valvecontrolling their inlets may be employed simultaneousl or separatelyeither to draw fluid simultaneously from both oiv the tanks 4 and 3 withvalve I55 open or by closing this valve to draw from single tanksseparately.

The discharge from pump I48 is carried by pipe IBi to a proportioningby-pass valve I 52, the side diversion outlet of which is joined by apipe I63 with the cross connecting pipe I5'I at the T I52. The principalstream outlet of valve I62 passes through pipe I64 to a volume meter I65and pressure gauge I66 and thence through the hose I61 to ahydraulically operated shut 01f valve I68. The flow from valve IE8 isfinally carried by joining connections into a distributing spray pipeI69.

In similar manner discharge from pump I50 is carried by pipe Hi] to aproportioning by-pass valve iii, the side diversion outlet of which iscarried into tank 4 by return pipe I12. The main stream outlet of valveI1I is joined by a pipe I13 which passes to a volume meter I14 andpressure gauge I15 from which hose I16 leads to a hydraulicallycontrolled shut off valve I11. Flow from valve I11 is finally carried byconnections to a distributing spray pipe I18. Spray pipes I69 and I18are interconnected by cross piping including a valve 202, so that thecapacity of both may be availed of to handle fluid delivered by eitherpump, if desired.

The proportioning by-pass valves I62 and HI are similar in constructionand are arranged to be hydraulically operated as shown more in detail inthe aforesaid parent application, each valve being operated by a pistonworking in a hydraulic cylinder I84 whose piston I82 is connected withthe valve by an operating lever I8I. Each piston is initially loaded bya spring I81 interposed between the piston and the end plug I83. Thesevalves are preferably piston type valves.

Similar hydraulic actuators I90 and I9I are provided, respectively, forvalves I68 and I11 with the exception that the returning springs thereofwhich are shown in detail in the aforesaid application are weaker tosuch an extent that a pressure suflicient to overcome the initialcompression of the springs associated with either of the valves I62 orI1I will be sufficient to cause valves I68 and I11 to be fully opened.

To supply and regulate the fluid under pressure for actuation of valvesI62 and I68, fluid available in branch conduit 53 is connected byconduits I 92 and I94 with the cylinder I84 of the valve I62 and byconduits I92 and I93 with the actuator I90. A by-pass connection I95controlled by a hand operated needle valve I96 joins with the returnconduit 62. With valve I96 closed, the full discharge pressure of pump49 is applied to the conduit I92 and with the valve I96 in intermediatestages of adjustment, various regulated pressures are applied to theconduit I92. With the valve I96 open, insufl'icient pressure is appliedto conduit I92 to overcome the return springs in the actuators of eitherof the valves I62 or I68 and both of said valves remain closed. In thisway the operator by closing down on valve I95 first brings about theopening of valve I68 and then by further closing down of valve I96causes the desired proportion of the delivery of pump I48 to be suppliedto the spray pipe I69. By inspection of the meter I65 or gauge I66 orboth the operator is thus able to establish any prescribed rate ofdelivery of fluid desired. Furthermore, in stopping delivery of fluid,complete opening of the valve I96 causes closure of valve I68,\thusavoiding prolonged after-drainage of fluid held in the long connectionsbetween valve I62 and the spray pipe I69.

In an entirely analogous manner and with analogous results control fluidregulated by the valve I91, interposed in by-pass connection I98 issupplied through conduit 66, connecting conduit I99 and connectingconduits 20I and 200 to actuator I9I and the actuating cylinder I84 forthe valve I1I, respectively.

Valves I96 and I91 are located on the transporting unit withinconvenient reach of the operator. A very desirable automatic regulationis also provided by this arrangement due to the action of the fixedaperture back pressure orifice 61, acting in conjunction with the enginedriven pump 49. If the engine speed (meaning engine is slowed for anyreason, the pressure in the actuators of valves I62 and HI will drop,and these valves will be closed a corresponding amount, thusproportioning the rate of application of fluid to the forward speed ofthe apparatus. In case the engine I0 stalls the valves all close, thusshutting off the flow of liquid.

I desire it to be understood that this invention is not to be limited toany particular form or arrangement of parts except in so far as suchlimitations are included in the claims.

What I claim as my invention is:

1. In a binder fluid supply system for a material treating apparatus ofthe class described, the combination comprising a binder fluid reservetank, a binder fluid pump, a spray pipe, a supply conduit connecting thedischarge of said pump with said spray pipe, a proportioning by-passvalve in said supply conduit, having a side branch rejection port, aconduit for disposing of rejected fluid from said side branch port,means connecting the inlet of said pump with said reserve tank, a out01f valve in said supply conduit adjacent to said spray pipe, a springloaded hydraulic actuator for said by-pass valve, a second spring loadedhydraulic actuator for said out off valve adapted to respond to a loweractuating pressure than said first mentioned hydraulic actuator, andmeans for supplying hydraulic actuating fluid to said actuators undercontrolled adjustable pressure.

2. In a binder fluid supply system for a material treating apparatus ofthe class described, the combination with a conduit containing a binderfluid under pressure, a spray pipe supplied by said conduit, a cut offvalve and a proportioning valve in said conduit, an hydraulic actuatorfor each of said valves, 9. source of hydraulic pressure fluid for bothof said actuators, and a manually controlled by-pass valve in saidsource to vary the operation of the actuator for said proportioningvalve and to control the operation of the actuator for said out 01fvalve.

3. An apparatus in accordance with claim 1 wherein the means forsupplying actuating fluid comprises a pump connected in drivenrelationship to a prime mover which in turn is connected in propellingrelationship to the material treating apparatus.

4. An apparatus in accordance with claim 2 wherein the source ofhydraulic pressure fluid for the actuators comprises a pump connected toa prime mover to be driven thereby at speeds proportional to the speedthereof which prime mover is mounted on said material treating apparatusin propelling relationship thereto.

HENRY C. HETTELSATER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 622,547 Shedlick et al Apr. 4,1899 830,046 Bole Sept. 4, 1906 1,010,158 Lent Nov. 28, 1911 1,544,509Vowell June 30, 1925 1,895,739 Spindt Jan. 31, 1933 1,960,472 Balaam etal May 29, 1934 2,009,418 Schwendner July 30, 1935 2,029,765 Durdin Feb.4, 1936 2,268,079 McKay et al Dec. 30, 1941 2,305,971 Livingston et a1.Dec. 22, 1942 2,334,679 Mason et al Nov. 16, 1943 2,345,297 SchwendnerMar. 28, 1944

